A company produces and sells a single product. Data concerning that product appear below: Selling price Variable expenses Contribution margin Per Unit $ 130 78 $ 52 Percent of Sales 100% 60% 40% The company is currently selling 6,000 units per month. Fixed expenses are $184,000 per month. The marketing manager believes that a $5,800 increase in the monthly advertising budget would result in a 200 unit increase in monthly sales. What should be the overall effect on the company's monthly net operating income of this change? Multiple Choice increase of $4,600 increase of $10,400 decrease of $5,800 decrease of $4,600